MT#55258 Add the 'proxy.skip_cf_loop: yes' by default

Since the 'proxy.skip_cf_loop' is disabled by default,
but we would like to use that config.yml option in our tests,
it's required to enable it, for all types of scenarios.

Change-Id: I694a5699f6e921c7f76219b2edf6d530990ac3da

scenarios/config.yml

@@ -26,3 +26,4 @@ kamailio:
           private_key: /etc/kamailio/stir/invite-peerout-stir.scenarios.test.key
         - name: invite-stir.scenarios.test
           private_key: /etc/kamailio/stir/invite-peerout-stir.scenarios.test.key
+    skip_cf_loop: 'yes'

scenarios_lnp/config.yml

@@ -8,3 +8,4 @@ kamailio:
         server: localhost
       enable: yes
       type: local
+    skip_cf_loop: 'yes'

scenarios_pbx/config.yml

@@ -9,5 +9,6 @@ kamailio:
     allow_refer_method: yes
     presence:
       enable: yes
+    skip_cf_loop: 'yes'
 pbx:
   enable: yes